Fëanor does, eventually, get around to asking "what else do you know that'd be of interest to me?"

"Your son is in love with Nolofinwë's," Thauron says, "and has and would choose him over you, your mother swore to kill you as a child, your only grandchild disowned his whole family, Elwing of Sirion leapt off a cliff after she lost the Silmaril, Elu Thingol regarded you as a pathetic waste of your father's line, the Silmarils will burn your hands, most of your children do not love you -"

"What's my fathername?"

"Curufinwë", Thauron says, and falls silent.

Promise? I think we're ready to dispose of this one.